"Single-point autofocus is ideal for portraits in which the subject is stationary. That's because the camera's autofocus system will select a focus point and keep it activated on the subject until you release the shutter button.

Conversely, continuous autofocus constantly makes adjustments to the focus point in order to track a moving subject, so long as you have the shutter button depressed halfway."

I'm getting started with back button focusing now too, now when I'm pressing that, isn't continuous autofocus in lock down already?

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I have various cameras all set to BBAF,
and there's no universal answer to your
query. Some default to "in effect" AF-S
altho controls seem to indicate you've
chosen AF-C. Some are otherwise. You
neglect to specify a particular camera
and even within a single brand, there's
no single answer.

If you simply wanna know about YOUR
particular camera [and FW maybe?] it's
best to find out by hands-on trials, cuz
in matters of subtlety, the user manual
will often just muddy the waters.

Just as a weird example, I found that
one of my cameras that I thought was
"safely" locked into BBAF was focusing
all by itself with no buttons touched at
all. Hadda dive into the menus and do
a few mysterious changes to fix that ...
IOW hands-on trials. Take notes ! You
can easily become dizzy remembering
what you think you last changed.

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